PRESSURE DROP DURING CONDENSATION OF R410A INSIDE HORIZONTAL MULTIPORT MINICHANNELS

摘要

In this study, the pressure drop's characteristics during condensation were investigated in an experiment of R410A flowing inside three types of multi-port tubes. Two types of multiport minichannels have 8 channels with a 1.16 mm hydraulic diameter and 11 channels with 1.14 mm hydraulic diameter. The test sections were designed as a counter flow tube in a tube exchanger. The experiment is performed with mass fluxes of refrigerant between 50-400 kg/m~2s, 3-12kW/m~2 of heat fluxes, and saturation temperature of 48°C. The frictional pressure gradient increased with increasing of mass flux and vapor quality but insignificant effect on with heat flux. The experimental results are compared with some well-known correlations for frictional pressure gradient in mini and micro channels.